Grey tank odor

[Frank P]

We have a 2019 Momentum 395M. Off and on we experience grey tank odor when opening the cabinet above the kitchen sink. The odor is not fro the sink but the
cabinet itself. Anyone have this problem? Any ideas? Appreciate your input.

 

[Fsalmy]

Check the air admittance valve under the sink.

 

[Frank P]

Check the air admittance valve under the sink.

Thanks for the info. But the odor is coming from the top cabinet, not under the sink or the sink itself. I just can’t understand how this happens.

Thanks again

 

[Lugnuts]

Having a similar issue but the smell is in the pantry and under the sink. Following.

 

[Daleahoke]

We have the same problem in the cabinet under our sink. Not the sink drain itself. There is no air admittance valve under our sink, the vent under our sink vents directly out the side, right near the sink. 2022, Momemtum 23G toy hauler.

 

[Second Chance]

Thread moved to Plumbing and Water Systems.

Rob